Book stand



FIG. 1 is a perspective view of a book stand showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a modified form wherein the base is arcuate. 

The ornamental design for a book stand, substantially as shown and described. 